Great way to maintain/boost your battery health

A few weeks back I took a look at my battery health on Coconut battery. My Mac has only been 18 weeks old and the health percentage was stunningly low at 89%!
I've searched inside out the internet and found no way to repair my battery health.
So ever since then I have taken two methods hoping that I can regain the lost battery health:

Shutdown my mac regularly instead of put to sleep

and only charge my mac when the battery percentage is lower than 20%

Over a few weeks time the health has bounced back to 94%!!

But I still have a question, is this temporary or permanent?

p.s. for some reason the coconut battery log isn't orded in date, sorry.

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